On Wed, May 16, 2018 at 11:33:40PM +0200, Frédéric wrote:
> > What should I do? Just try to reboot another time?
> Ctrl+Alt+Suppr did not work.
> Ctrl+Alt+SysReq works only for key S "Emergency Sync complete". All
> other keys in REISUB give "This sysrq operation is disabled.

I never heard that <ctrl> might be part of the sysrq combo.

Here on an x86 it's 

0: press <alt>, keep holding
1: press <fn>-<print>, release  <fn>-<print>
2: press the magic key, release it
3: release <alt>

But maybe you have most sysrq keys disabled: if you do a 
cat /proc/sys/kernel/sysrq
you might see what currently is set (my guess: 16).

more on the topic:


And careful: hitting 'c' in sysrq will crash your system .. :)

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